Actually, the only place I've ever seen them is here. Amnesty Int'l's DC office used to have 100s of them from some campaign they ran way back. Don't know if anyone in the office would know where they got them, but you might want to give them a try. The Guatemala Human Rights Commission in DC also might be able to give a lead.
I worked there in 2000, and the campaign had been before that. Maybe in conjunction with the release of the REMHI report?
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